The Thessaloniki Water Supply and Sewerage Co. S.A. is responsible for the water supply of the Thessaloniki urban complex and the collection and the convey of the urban waste waters to the Waste Waters Treatment Installations.
It originates from the merging, in 1998, of the Thessaloniki Water Supply Co. (OYTh) and the Thessaloniki Sewerage Co. (OATh).
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